http://bugzilla.xensource.com/cgi-bin/bugzilla/show_bug.cgi?id=43
Summary: Linux xenU vbd doesnt scan for partitions beyond first
partition
Product: Xen
Version: unstable
Platform: x86
OS/Version: other
Status: NEW
Severity: normal
Priority: P2
Component: Guest-OS
AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
ReportedBy: paul+xen@xxxxxxxxx
Hi,
Linux xenU's vbd does not appear to scan for extra partitions if a whole disk is
specified:
# grep ^disk test2-fc4
disk = [ 'phy:VG01/test2_xenu_lv,hda,w' ]
# xm create -c test2-fc4 extra=single
Using config file "test2-fc4".
Started domain Test2-FC4, console on port 9617
<snip various kernel init messages>
xen_blk: Initialising virtual block device driver
hda:<6>xen_net: Initialising virtual ethernet driver.
hda1
# fdisk /dev/VG01/test2_xenu_lv
Command (m for help): p
Disk /dev/VG01/test2_xenu_lv: 4294 MB, 4294967296 bytes
255 heads, 63 sectors/track, 522 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/VG01/test2_xenu_lv1 1 86 690763+ 83 Linux
/dev/VG01/test2_xenu_lv2 87 209 987997+ 82 Linux
swap / Solaris
/dev/VG01/test2_xenu_lv3 210 522 2514172+ 8e Linux LVM
If I use device-mapper in dom0 to create dm devices mapped to each partition:
# dmsetup ls
VG01-usr_lv (253, 0)
test2_xenu_lv3 (253, 6)
VG01-var_lv (253, 1)
test2_xenu_lv2 (253, 5)
test2_xenu_lv1 (253, 4)
VG01-test_xenu_lv (253, 2)
VG01-test2_xenu_lv (253, 3)
And then specify each individual 'partition' in the configuration for the domU:
disk = [ 'phy:mapper/test2_xenu_lv1,hda1,w',
'phy:mapper/test2_xenu_lv2,hda2,w',
'phy:mapper/test2_xenu_lv3,hda3,w' ]
It works.
However, I'd like to be able to specify just a single whole disk for xenU's, to
avoid:
- domU's being able to screw up bootup of dom0's (eg some distro's mount devices
by ext2/3 label or uuid. If dom0 'visible' fs devices are under control of domU
they potentially could screw up booting of dom0).
- dom0 having to be involved in filesystem management of domU's, beyond "could
you extend my disk please?".
regards,
--paulj
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